Impossible to know without any specifics of your AI files. What one man considers "only a few shapes" is another man's most complex project. And on top of it it would depend how you created the artwork and how clean it is. Using tools like Shape Builder in AI can create tons of extraneous anchor points for instance and even cimple squares and circles can easily have multiple the times of points than would be necessary for their visual appearance. If you haven't done the necessary cleanup, that alone could be an issue. Anyway, just hypothesizing of course. More info is definitely needed.